Paste-applying mechanism.



H. C. HERR.

PASTE APPLYlNG MECHANISM.

5, if 6 z 2 w/n. 1 of Patented May 7,1918. '2 SHEETS-SHEET 1 I H, C.HERB. PASTE APPLYiNG MECHANISM. APPLICATION FILED on. 21. 1913.

1,265,202. Patented May 7,1918.

2 SHEETS-SHEET 2.

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UNITED STATES PATENT OFFICE.

HENRY G. HERR, 0F PITTSBURGH, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN-MENTS, TO SOUTH SIDE TRUST COMPANY, TRUSTEE, 0F PITTSBURGH, PENNSYL-VANIA, A CORPORATION OF PENNSYLVANIA.

PASTE-APPLYING MECHANISM.

' Specification of Letters Patent.

Patented May '7, 1918.

Application filed October 21, 1913. Serial No. 796,448.

gheny and State of Pennsylvania, have invented certain new and usefulImprovements in Paste-Applying Mechanism, of which the following is aspecification, reference being had therein to the accompanying drawings.

The invention relates to paste-applying mechanism more particularlydesigned for use in connection with machines for forming cylindricalcasings of a plurality of plies of wound paper or fiber stock. In themanufacture of such articles it has been found desirable to employ as apaste or adhesive silicate of soda, which forms a strong binder betweenplies, but which, when exposed to the air, quickly becomes incrusted. Itis therefore necessary to continually remove the surface portion of theliquid to prevent such incrustation, this having been heretoforeaccomplished by providing an overflow at the desired height within thetank or receptacle. My improved construction is particularlyintended foruse on windingmachines in which, in addition to the winding of the paperstock, a metallic reinforcement is wound-in intermediate the paperplies, and my improved paste-applying mechanism is adapted for coatingnotonly the paper but also the reinforcement. To this end the inventionconsists in various features of construction as hereinafter set forth.

In the drawings:

Figure 1 is a section through the paste receptacle, showing the same inrelation to the winding-drum.

Fig.1 is an elevation of the mechanism for raising and lowering thepaste-applying roll. 7

Fig.2 is a plan view thereof.

Fig. 3 is a cross section through the guides for the paper.

Fig. 4.- is an enlarged section of the paste applying roll illustratingvarious positions of adjustment thereof.

A is a winding-drum on whichthe cylindrical package is formed; B is atable from which the paper or fiber stock is fed tangentially to thedrum A; and C is a table on the opposite side of the drum from which thereinforcing sheet is fed, which latter passes around a guide D impartingthe desired curvature thereto and then is delivered tangentially to thewinding-drum ad acent to the point of tangency of the paper stock.

To cause the overlapping plies of paper 5 stock to adhere to each other,the paste or adhesive is applied to the underside of the stock as it isfed to the winding-drum, but it is necessary first to feed a length ofthe stock suflicient to form one convolution upon the drum before thepaste is applied, as otherwise the winding would adhere to the drum.This is accomplished by raising and lowering the paste roll which ispartially immersed in the tank or receptacle for holding the paste, thespecific construction being as follows: E is the tank or receptacle,which is mounted preferably beneath the table B. F is a paste-applyingroll mounted upon a vertically-adjustable frame H controlled by a cam I,mounted upon a shaft I, actuated by a rock arm I which in turn isactuated by a cam, (not shown) the arrangement being such that the rollis lifted into contact with the lower face of the paper or fiber stockwhen the latter is to be coated, and is depressed when said stock is toremain uncoated so as to be'out of contact therewith.

The reinforcement is fed through the guide D as previously described andis embedded between plies of the paper stock, one surface thereof comingin contact with the surface of'said stock which has been coated withthepaste. It is desirable, however, to cement both of the surfaces, and forthis purpose a second paste-applying roll G is arranged to contact withthe under face of the metallic reinforcement. This necessitates thepassing of the reinforcement strip between the rolls F and G, and, as Idesire to avoid the use of two separate tanks for said rolls, a singletank is provided with a passage therethrough sufficient for the feedingof said reinforcement. This is preferably formed by spaced partitions Jand K, which form therebetween a well or passageway through which thereinforcement may be fed, while upon opposite sides of said partitionsare the chambers in which the paste is held. These chambers areconnected to each other at opposite sides of the'receptacle bycross-passages J which permit the passage of the paste from onecompartment to the other.

For preventing the scum forming on the surface of the adhesive, conduitsL and M are connected to the tank E, one entering the compartment inwhich the roll G is located, while the other connects with the overflowin the compartment having the roll F. The two compartments beingconnected by the passages J, the liquid will flow from the one to theother and the surface portion will pass toward the overflow and passoutward through the conduit L to the supply tank, being then returnedthrough the conduit M. The roll F is constantly rotated when out ofcontact with the lower face of the paper or fiber strip by gear wheels 0and P. The wheel 0 is constantly driven from any suitable source ofmotion and through the intermeshing teeth drives the wheel P, which isupon the shaft of the roll F. lVhen, however, the frame H is lifted, thewheel P will be disengaged from the wheel 0, but the contact of the rollF with the moving strip of paper will continue the rotation.

The raising and lowering of the roll F will cause a fluctuation of theliquid level in the compartment of the tank in which said roll islocated since the overflow will be temporarily out out. which will allowan abnormal quantity of liquid to accumulate. This abnormal quantity ofliquid will be displaced by the roll when the latter is in loweredposition, which might result in the slopping over of the liquid from thetank when the roll is again lowered, by reason of the fact that theliquid is constantly entering through the conduit M but only passes outwhen the level of liquid is above the overflow.

Such a result I have avoided by placing the overflow in the compartmenthaving the roll F, and by making the entrance L, to the overflow pipe Lof suflicient capacity to take care of the accumulation during theinterval in which the roll is raised. The compartment containing theroll G is connected with the compartment containing the roll F by therestricted passages J, which regulate the flow, so that the level in thecomlimit the thickness of the film of adhesive carried upward by saidroll. Furthermore, I have provlded means for varying the thickness ofthe film depending upon the relative positions of the roll and thescraper. This latter adjustment is effected by the raising and loweringof the roll, which, when in a position tangent to the plane of thepaper, indicated by the dotted line F in Fig. I, will receive a greaterthickness of film than when further elevated into the position F Such aresult is obtained by rea son of the relation of the scraper Q, to thepivot center H of the frame H, and it will be noted that the higher theframe is elevated the nearer the periphery of the roll approaches theedge of scraper. Thus, when the paste is first applied to the paper acomparatively thick film is deposited, to firmly cement the paper to thereinforcement, as well as to fill the interstices in the latter. When,however, the end portion of the paper strip is reached, if an equallythick film is provided, a surplus would be squeezed out and smeared overthe outer face of the package, but such a result is prevented by theraising of the roll to decrease the thickness of the film, as abovedescribed.

The location of the paste-roll F is necessarily some distance from thepoint of tangency of the paper strip with the winding drum A, and as theunderside of the strip is coated with adhesive it cannot be supportedupon a table. I therefore provide supporting guides It which, as shownin Fig. 3, are arranged below the paper strip, but are in the form ofthin bars having a very limited area of contact with the strip. Coatingofthese guides with adhesive is prevented by the cutting of grooves S inthe paste-roll F,so

that in depositing the film of paste a narrow strip is left uncoated.which strip registers with the guide B. This will not, however,interfere with the adhesion, for the thickness of film on the paper issuflicient to spread out and cover the unpasted strip by the pressure ofone convolution upon another during the winding.

To insure the adhesion of the end of the strip to the adjacent ply, itshould be pressed in contact and held for an instant to permit theadhesive to set. For this purpose I have provided a presser bar T, whichis supported by resilient arms T over the winding drum A, the lower faceof said bar being concaved and being in a position above the end of thepaper strip upon the completion of the winding operation. The spacebetween thebar T and the drum is sufficient for the free passsage of theforward end of the paper strip when it is fed into engagement with thedrum, but after oneconvolution has been wound on the drum, a secondconvolution will press against the concave face of the bar T and thepressure will be increased the greater the number of convolutionsf Thusat the end sure is applied by the bar T against the paper, and this issuflicient to insure permanent adhesion of the end of the strip to theunderlying ply.

In operation the winding drum A being rotated and the paper strip beingfed thereto by mechanism (not shown), the paste is applied to the stripas follows: The normal position of the roll F is one in which it is outof contact with the paper strip, and in such position it is constantlyrotated by the intermeshing gears O and P, so as to prevent incrustationwith dry adhesive. The roll G is not rotated excepting where it is incontact with the metallic reinforcement, but the hard surface of thereinforcement will scrape off any incrustation which maybe formed onthis roll.

lVhen a sufficient length of the paper strip is fed beyond the roll F toform one convolution on the drum A, said roll is raised through themedium of the cam I and timed operating mechanism therefor (not shown).This will disengage the intermeshing gears O and P, and will alsocontact the periphery of the lOll F with the underside of the paperstrip to deposit thereon the film of adhesive applied to the roll. Thiswill continue until the greater part of the paper strip is wound uponthe drum, but before the end of the strip passes the roll F, the latteris raised to its highest position F by the cam I, which, by the closerproximity from the scraper Q to the periphery of the roll, will decreasethe thickness of the film of adhesive. This, as above described, willavoid the squeezing out of the adhesive at the end of the strip and thesmearing of the same over the outer face of the package.

WVhat I claim as my invention is:

1. A paste-applying mechanism, comprising a paste-holding receptaclehaving two compartments, paste-applying rolls respectively in saidcompartments, means for raising and lowering one of said rolls, meansfor supplying and removing paste from the receptacle, and a restrictedconnection between said compartments for supplying the paste from one tothe other and for limiting the fluctuation in level in the compartmentfor the stationary roll occasioned in the other compartment by theraising and lowering of the roll.

2. A paste-applying mechanism, comprising a plurality of paste-applyingrolls, means for raising and lowering one of said rolls, a common pastereceptacle provided with separate compartments for said' rolls and apassageway therebetween, means for feeding a sheet to be pasted throughsaid passageway intermediate said rolls, a restricted connecting passagebetween said compartments external to said passage for said sheet, andmeans for maintaining a supply of paste to said receptacle.

3.111 a paste-applying mechanism, the combination with a paste-applyingroll of means for raising and lowering said roll at predeterminedintervals, a paste recep 'tacle in'which a portion of said roll isimmersed, means for feeding paste into and out from said receptacle tomaintain a constant supply therein, and an overflow for receiving thedisplaced paste when said roll is lowered in the receptacle.

4. In a paste-applying mechanism, the combination with paste-applyingroll, of timed means for raising and lowering said roll, a receptaclefor the paste having a supply connection thereto, and an overflowconnection, said overflow having an entrance of sufficient capacity toreceive the displaced paste upon the lowering of the roll in saidreceptacle.

5. The combination with means for feeding a paper strip, of apaste-applying roll arranged beneath the path of said strip, areceptacle in which said roll is partially immersed, means forvertically adjusting said roll to contact the periphery ofv the samewith said strip and to also raise the roll into a higher position ofadjustment, and means for varying the thickness ofthe film of paste uponsaid roll applied to said strip, the thinnest film being applied in thehighest position of said roll.

6. A paste-applying mechanism, comprising a plurality of paste-applyingrolls, acommon paste receptacle having separate compartments for therespective rolls and a passageway therebetween, means for feeding asheet to be pasted through said passageway and between said rolls, meansfor raising and lowering one of said rolls, and means for maintaining asubstantially constant level of the paste in the other compartment.

7. In a paste-applying mechanism, the combination with a paste-holdingreceptacle, of a roll, timed means for raising and lowering said roll,and means for positively rotating said roll in one position of verticaladjustment, said means being inoperative in the other position ofadjustment.

In testimony whereof I afiix my signature in presence of two witnesses.

HENRY C. HERB.

, Witnesses:

C. C.-MoRRIsoN, E. F. RrrENoUR.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G. v

